Final answer:
The statement is True; by default, Splunk does not replicate report or data model accelerations as they are knowledge objects local to a search head. For replication in a clustered environment, separate configuration to enable knowledge bundle replication is necessary.
Step-by-step explanation:
The statement regarding Splunk's default settings is True. By default, Splunk does not replicate report accelerations or data model accelerations. This is primarily because these accelerations are considered part of the search head's knowledge objects, and in a distributed search environment, they stay local to the search head unless specifically configured for replication.
In a clustered environment, Splunk uses the Indexer Clustering feature to ensure that raw data is redundantly stored across multiple indexers. However, knowledge objects like report accelerations that are used to speed up the search performance are not replicated across the cluster by default. If replication of these objects is needed, a user must enable knowledge bundle replication separately. Thus, ensuring high availability of report and data model accelerations requires deliberate configuration.